Old thread, but if you're interested, here is a link that talks more about it:
Or you can Google Stanford University Type 2 Diabetes Autoimmunity, and get a whole raft of articles.
To those of you who are concerned about other issues, like what about the folks who aren't overweight or obese, I'd like to remind you that T2 is a GARBAGE CAN diagnosis -- anyone who doesn't have the classic T1 antibodies is, by definition, T2, but that doesn't mean they all have the same disease. Those who ARE obese, and have metabolic syndrome and are demonstrably insulin-resistant, fit what I call "classic T2" (NO blame intended!), but there are a significant number, although a minority, of people who are called T2 but who DON'T have the classic disease. No one has actually described what these people have (excluding those who actually have LADA or MODY), so I have called it Type Weird for many years.
The term "Thin T2" is a bad one, because it points doctors' thinking in the wrong direction -- right straight towards insulin resistance and weight loss, when that might not be the problem at all. But the fact is that NO ONE knows what the problem is. If you want to talk about an orphan disease, you guys are IT. That's why I like Type Weird -- at least I'M acknowledging that you're NOT classic T1, nor classic T2, nor MODY nor LADA if you've been tested for them. Wish I was a scientist and wish I had the funds to research it!